赚现金
计算:.
计算: ( 1 2 ) - 1 + 2 cos 60 ° - ( 4 - π ) 0 + | - 3 | .
计算: 2020 0 + 8 3 sin 30 ° - ( 1 2 ) - 1 .
计算: ( - 3 ) 2 + 2 × ( 2 - 1 ) - | - 2 2 | .
计算: 2 cos 45 ° + ( π - 2020 ) 0 + | 2 - 2 | .
计算: 2 0 + ( 1 3 ) - 1 · 4 - 4 tan 45 ° .
计算: - 8 3 + | 3 - 1 | - 2 sin 60 ° + ( 1 4 ) 0 .
(1)计算: | 1 - 2 | - 2 sin 45 ° + ( - 2020 ) 0 ;
(2)解不等式组: - ( x - 1 ) > 3 , 2 x + 9 > 3 ·
计算: ( 1 2 ) - 1 - | - 2 | + 2020 0 .
(1)计算: 2 ÷ 1 2 - ( - 1 ) 2020 - 4 - ( 5 - 3 ) 0 .
(2)先化简,再求值: ( a + 3 - a 2 a - 3 ) ÷ ( a 2 - 1 a - 3 ) ,自选一个 a 值代入求值.
(1)计算:;
(2)先化简,再求值:,其中从,2,3中取一个你认为合适的数代入求值.
(1)计算;
(2)先化简,再求值:,其中.
试题篮